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Surface atomie resolution microscopy of sulfated-zirconia and Fe/Mn promoted sulfated zirconia

Published online by Cambridge University Press:  10 February 2011

M. Benaissa ,
J. G. Santiesteban ,
G. Diaz  and
M. José-Yacamán
M. Benaissa
Affiliation:
Inst. Nacional de Investigaciones Nucleares (ININ), Gerencia de Materiales, Mexico D.F., MEXICO, e-mail: mohamed@sysull.ifisicacu.unam.mx
J. G. Santiesteban
Affiliation:
Air Products & Chemicals, Inc., Allentown, PA 18195–1501, USA
G. Diaz
Affiliation:
Instituto de Física - UNAM, A.p. 20–364, Mexico D.F. 01000, MEXICO
M. José-Yacamán
Affiliation:
Instituto de Física - UNAM, A.p. 20–364, Mexico D.F. 01000, MEXICO
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Abstract

By using high-resolution transmission electron microscopy (HRTEM), it was possible to elucidate edge-on views of the surface atomic structure of sulfated zirconia and Fe/Mn promoted sulfated-zirconia catalysts. The results indicate that the presence of sulfate groups and Fe/Mn species not only stabilizes the tetragonal zirconia phase, but also induces the formation of well-faceted small zirconia crystallites. The shape of the sulfated zirconia crystallites exhibits two types of surfaces: long smooth and relatively few short rough planes, with the long smooth (110) plane being clearly predominant. HRTEM images of this plane revealed the presence of an adsorbed sulfate layer. On the other hand, the presence of Fe and Mn species were apparent on the (001) and (110) surfaces of zirconia particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 466: Symposium G – Atomic Resolution Microscopy of Surfaces and Interfaces , 1996 , 267
Copyright
Copyright © Materials Research Society 1997

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References

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